Unable to deliver the message due to a communications failure

I'm the network admin to a corp. and the problem I'm having is I'm able to send email through or exchange 5.5 server but certain email addresses when sent to are unable to delivered. I checked to see if we have a reverse dns and it has been added since we didn't have one through our ISP any more info need please let me know
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

randtaraadAuthor Commented:
Thanks ... sorry I'm new to this forum.
This sounds like DNS issue. If U are using Exchange server 5.5, make sure U are using good and reliable DNS.
and I would check to see if your domain is open to relay. Please check to see if your domain is on the blacklist.

Let me know if U need how to check if the dns you r using is reliable dns

good luck

randtaraadAuthor Commented:
if you wouldn't mind giving me some tips that would be very helpful. I kinda figured that it could be a dns. Issue like I said I checked for a reverse DNS since some email servers won't accept email with out one but the funny thing is that it worked a couple of weeks ago just find I tried to trace where the problem was but I can't seem to find it we have 2 servers running nt server one the wins and exchange server the other the DNS and file server ... thanks
Big Business Goals? Which KPIs Will Help You

The most successful MSPs rely on metrics – known as key performance indicators (KPIs) – for making informed decisions that help their businesses thrive, rather than just survive. This eBook provides an overview of the most important KPIs used by top MSPs.


start>run> and type cmd and ENTER
at the command prompt type

nslookup ENTER
type this " Server space the external DNS server U using

i.e server then enter
set q=mx ENTER

type the domain you are sending the email to ..

It should resolve to their MX record

If it does not work, then you have DNS issues

randtaraadAuthor Commented:
if that doesn't work what do you think could be wrong with the DNS?
is there anyway you can put in the entire failure message?

Alot of anti-spam servers poping up around the net... might be something from one of them.
randtaraadAuthor Commented:
>  -----Original Message-----
> From:       System Administrator  
> Sent:      Thursday, November 20, 2003 3:15 PM
> To:      'rick.thompson@coach-equipment.com'
> Subject:      Undeliverable: test

> Your message did not reach some or all of the intended recipients.

>       Subject:      test
>       Sent:      11/20/2003 3:15 PM

> The following recipient(s) could not be reached:

>       'rick.thompson@coach-equipment.com' on 11/20/2003 3:15 PM
>             Unable to deliver the message due to a communications failure
>       The MTS-ID of the original message is: c=US;a= ;p=Romeo
> RIM;l=SIDEWINDER-031120201430Z-94

randtaraadAuthor Commented:
I tried emailing it from other workstations and also from home I can email from home through my email at Atumus but I can't through my work email nor can any other employee in side the building
These are the mail servers for that domain:

coach-equipment.com      21600       MX  5      mx4.business.mindspring.com
coach-equipment.com      21600       MX  5      mx5.business.mindspring.com
coach-equipment.com      21600       MX  5      mx1.business.mindspring.com
coach-equipment.com      21600       MX  5      mx2.business.mindspring.com
coach-equipment.com      21600       MX  5      mx3.business.mindspring.com

Ok, do this, from your work email server:

C:\telnet mx4.business.mindspring.com 25

You will connect, but it takes a minute for their server to respond for some reason, probably to delay spammers.

Next do this, it will respond after each command, so pay attention to what it says:

helo user
mail from: <you@yourdomain.com>
rcpt to: <rick.thompson@coach-equipment.com>
some text or whatever you want to type... i like to bang on the keyboard or type test then you do a dot on a single line by itself like so

At this point it should say mail queued for delivery.  Being your are having issues, i bet you dont make it to this point.
Check your Event log, you should be getting warning errors. Please send me what the errors are.

here another article that talks about it


When you ping your own server, what does it respond to? Does it respond to

ping test    



ping test

test (the IP address)

your exchange server NIC card DNS settings, what are the orders of your DNS server

Internal DNS followed by external DNS or vise versa

This is all I am assuming you have one exchange server

your problem is nothing but lasy DNS somewhere...please do these tests above and let me know

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
randtaraadAuthor Commented:
thanks for your help so far I'm going to try and see where it all leads I'll keep you posted thanks for your help thus far
randtaraadAuthor Commented:
thanks for all your help guys I'm glad I finally have this issue solved
Hey I am having the same exact problem, how did he resolve the problem?
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.